Question

During electrolysis of fused calcium hydride, the hydrogen is produced at:

• A. cathode
• B. anode
• C. hydrogen is not liberated at all
• D. $H_2$ produced reacts with oxygen to form water

Answer 1

Answer: (B)

anode

$Ca{H}_2\stackrel{Electrolysis}{\to }C{a}^{2+}+2H^{-}$

At cathode (reduction) :
$C{a}^{2+}+2e^{-}\to Ca$

At anode (oxidation) :
$2H^{-}\to H_2+2e^{-}$

At the anode, hydrogen is produced.

Hence, option $B$ is correct.